849869 has 2 divisors, whose sum is σ = 849870. Its totient is φ = 849868.

The previous prime is 849857. The next prime is 849883. The reversal of 849869 is 968948.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 532900 + 316969 = 730^2 + 563^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-849869 is a prime.

It is a super-2 number, since 2×849869² = 1444554634322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (849829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 424934 + 424935.

It is an arithmetic number, because the mean of its divisors is an integer number (424935).

2⁸⁴⁹⁸⁶⁹ is an apocalyptic number.

It is an amenable number.

849869 is a deficient number, since it is larger than the sum of its proper divisors (1).

849869 is an equidigital number, since it uses as much as digits as its factorization.

849869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 124416, while the sum is 44.

The square root of 849869 is about 921.8833982668. The cubic root of 849869 is about 94.7219571102.

The spelling of 849869 in words is "eight hundred forty-nine thousand, eight hundred sixty-nine".